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首页> 外文会议>Conference on Optical Components and Materials; 20080121-23; San Jose,CA(US) >Using highly dispersive fiber gratings as wavelength-tunable true-time- delay In phased array antenna
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Using highly dispersive fiber gratings as wavelength-tunable true-time- delay In phased array antenna

机译：使用高度分散的光纤光栅作为相控阵天线中的波长可调实时延时

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摘要

We have designed, assembled and tested a phase-array antenna using fiber Bragg gratings in the highly dispersive transmission region as our tunable true-time delay (TTD) generators. The TTD generator is designed by cascading 29 identical fiber gratings and 1×2 fiber splitter pairs. Tapping from each fiber splitter allows us to steer our RF microwave beam from a 30×4-element antenna by tuning the wavelength of a laser. The 10Ghz RF signal is superimposed upon a laser beam by means of a LiNbO_3 modulator. However, with a conventional modulator, the optical frequency spectrum of the modulated beam consists of two sidebands on opposite sides of the optical carrier; all three of which may experience very different time delays due to dispersion. This may have detrimental effects on time-delay sensitive processes such as antenna beamforming. Therefore, we studied the use of single-sideband versus double-sideband modulators in the transmitters of photonic phased array antenna. We focus in particular on the effect of the different spectral profiles of single and double sideband modulators on beamforming when using the fiber Bragg gratings as TTD generators. With very high dispersion in our fiber Bragg gratings close to the band edge, the absolute propagation times are different for each sideband and the optical carrier. Therefore double sideband modulated signals will generate two sets of separate delays in the same microwave signal which causes beam deterioration and increased side-lobes. We demonstrated this theoretically and verified experimentally by comparing the antenna patterns generated by single-sideband and by double sideband modulators.
机译：我们已经在高度分散的传输区域中使用光纤布拉格光栅作为我们的可调实时延迟（TTD）发生器来设计，组装和测试相控阵天线。 TTD发生器是通过级联29个相同的光纤光栅和1×2光纤分离器对来设计的。从每个光纤分路器中窃听使我们能够通过调整激光器的波长来引导来自30×4元件天线的RF微波束。 10Ghz RF信号通过LiNbO_3调制器叠加在激光束上。然而，对于传统的调制器，调制光束的光谱由光载波相对侧上的两个边带组成。这三者由于分散而可能经历非常不同的时间延迟。这可能会对诸如天线波束成形之类的时延敏感过程产生不利影响。因此，我们研究了在光子相控阵天线的发射机中使用单边带调制器还是双边带调制器。当使用光纤布拉格光栅作为TTD发生器时，我们特别关注单边带调制器和双边带调制器的不同光谱轮廓对波束成形的影响。由于我们的光纤布拉格光栅的色散非常接近色带边缘，因此每个边带和光载波的绝对传播时间都不同。因此，双边带调制信号将在同一微波信号中产生两组独立的延迟，这将导致波束质量下降和旁瓣增加。我们通过比较单边带调制器和双边带调制器生成的天线方向图，从理论上证明了这一点，并通过实验进行了验证。

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